Bone rotation puzzle in edit mode


A noob problem, I was trying to follow a finger rigging tutorial vid when I ran into a transform puzzle. It’s a simple three bones rig on Y axis with bones’ Z axes point up. The starting and ending points of the bones are perfectly aligned with Y axis.

I was trying to rotate all three bones with Y axis constraint in Edit Mode, so the bones’ Z axes are pointing downward. But it doesn’t do anything even though Tool panel shows it has been rotated. Rotating it in X and Z constraint works fine. The workaround is to switch to Object Mode, then I can rotate it 180 degree with Y axis constraint. So what am I missing here? Thanks in advance.

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If you switch to pose mode, you can rotate in y.

If you want to rotate in edit mode, CTR-R Mouse Drag

Thank you, motimo. Numerical input in the Object’s Transform parameter rotates the bone, Ctrl-R rolls it too but rotation in Transform remains unchanged. Both do the job, which is change bone’s orientation. What is the difference between Roll and Rotate in Edit Mode?

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What is the difference between Roll and Rotate in Edit Mode?

Rotate…
of coarse actually rotates the bone…

Roll…
Rotates the default starting Transition Location …

That is…

it resets where Zero Rotation is…
This is useful when trying to minimize Bone Flipping and Gimbal Lock

Got it, thanks norvman.

This acutally works to your advantage when your struggling with some kind of goofy bone flipping or Gimbal lock in pose mode…

you simply go back to edit mode and reset the bone roll some different starting point and you can then avoid flipping and Gimbal lock…

at least to some extent…

It always sounds more confusing than it is.

It always sounds more confusing than it is.

LOL! that’s right…

There is no rotation for bones in edit mode. There is only a location for the head, a location for the tail, and the roll. The rotation you highlighted in the screen shot is for the armature object, not the bone. You can rotate bones in edit mode, but it just changes the location of the head and tail. AND rotating on the Y axis of the bone doesn’t set it’s roll. Maybe it should, but it doesn’t.